CN102916582A - Bridge-type dual-mode wide-input buck converter - Google Patents

Bridge-type dual-mode wide-input buck converter Download PDF

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Publication number
CN102916582A
CN102916582A CN2012104714406A CN201210471440A CN102916582A CN 102916582 A CN102916582 A CN 102916582A CN 2012104714406 A CN2012104714406 A CN 2012104714406A CN 201210471440 A CN201210471440 A CN 201210471440A CN 102916582 A CN102916582 A CN 102916582A
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diode
switch
node
converter
bridge
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CN102916582B (en
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陆治国
田海涛
祝万平
赵丽丽
吴春军
汪渊
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Chongqing University
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Chongqing University
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Abstract

The invention discloses a novel bridge-type dual-mode wide-input buck converter and belongs to a direct current/direct current converter. The converter comprises a wide range input power supply, a filtering inductor, a filtering capacitor, two pump-rising capacitors, a load equivalent resistor, a group of metal-oxide-semiconductor field effect transistor (MOSFET) switch bridges and a group of diode bridges. The novel bridge-type dual-mode wide-input buck converter has two working modes, when an input voltage class is high, the converter works under a first mode, the voltage transmission ratio is D/2; and when an input voltage class is low, the converter works under a second mode, and the voltage transmission ratio is D. Compared with a BUCK converter under same situations in the two different modes, the input voltage range of the converter is wide, voltage stress of a switch tube is reduced by a half, and current stress is unchanged. Therefore, the novel bridge-type dual-mode wide-input buck converter is applicable to depressurization fields with wide input voltage class ranges.

Description

The double mode wide input buck converter of bridge-type
Technical field
The present invention relates to a kind of circuit topological structure and application thereof of DC/DC converter, be particularly suitable for the wider step-down occasion of input voltage rate range, and be a kind of converter that possesses double mode automatic switching function.
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Background technology
Along with the development of power electronic technology, semiconductor device, and the extensive use of Switching Power Supply in every profession and trade, the demand of DC/DC converter has been become increasing, it at partial row already through becoming a sign weighing economic development.For traditional voltage-dropping type BUCK converter, it belongs to single-stage converter, and its voltage transmission ratio can not be very high, namely can not well be applicable to require the occasion of wide input; The inverse peak voltage that its fly-wheel diode can bear is the maximum voltage value decision by input, and it is higher to work as input voltage, the switch conduction time is shorter, diode bears more high shorter high voltage pulse during switch conduction, the voltage that its switching tube bears at blocking interval also has input voltage to determine.Therefore, in the high input voltage occasion, because it is constant to flow through the average current of diode, switching tube, cause that its temperature sharply rises, energy consumption increases, thereby whole transducer effciency is descended, even cause permanent damage.
Twin-stage cascade connection type BUCK converter is a kind of multilevel converter, and it can effectively improve the some shortcomings of single-stage BUCK converter, but owing to increased by one times circuit devcie, its that makes is bulky, and control is complicated, and system is unstable etc.Crisscross parallel BUCK converter also belongs to a kind of multilevel converter, it is owing to the company's of taking staggered branch road is worked respectively, be conducive to the heat radiation of system and reducing of filter inductance value, but the voltage stress of its diode, switching tube do not reduce, and the inapplicable occasion that requires wide input.Non-isolation three level BUCK converters also belong to multilevel converter, its dividing potential drop by two series capacitances, and the diode that effectively reduces, the voltage stress of switching tube, but the problem that exists remains and can not be applicable to require wide input occasion.What more than introduce all is the non-isolation type buck converter.For the isolated form buck converter, because the existence of isolation module is arranged, so that the volume and weight of converter increases greatly, control also relative complex, also to consider the EMC(Electro Magnetic Compatibility) etc. problem, so generally do not consider at this.
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Summary of the invention
For the prior art above shortcomings, the object of the present invention is to provide the double mode wide input buck converter of a kind of bridge-type, it is better compatible to reduce switching device (switching tube and diode) voltage stress and the advantage that increases the voltage transmission ratio, makes it better be applicable to the wider occasion of input voltage rate range.
Realize above-mentioned purpose, the present invention adopts following technical scheme: the double mode wide input buck converter of a kind of bridge-type, it is characterized in that, and comprise: the switch bridge
Figure 2012104714406100002DEST_PATH_IMAGE002
, diode bridge
Figure 2012104714406100002DEST_PATH_IMAGE004
, two pumps rise electric capacity
Figure 2012104714406100002DEST_PATH_IMAGE006
,
Figure 2012104714406100002DEST_PATH_IMAGE008
, filter inductance And filter capacitor
Figure 2012104714406100002DEST_PATH_IMAGE012
Wherein, described switch bridge
Figure 849652DEST_PATH_IMAGE002
By 4 N channel enhancement switch mosfets
Figure 2012104714406100002DEST_PATH_IMAGE014
,
Figure 2012104714406100002DEST_PATH_IMAGE016
,
Figure 2012104714406100002DEST_PATH_IMAGE018
With
Figure 2012104714406100002DEST_PATH_IMAGE020
Form first switch
Figure 829109DEST_PATH_IMAGE014
With the 3rd switch Series arm and second switch
Figure 193936DEST_PATH_IMAGE016
, the 4th switch
Figure 8308DEST_PATH_IMAGE020
Series arm in parallel; First switch
Figure 768453DEST_PATH_IMAGE014
Source electrode and the 3rd switch
Figure 35487DEST_PATH_IMAGE018
Drain electrode link to each other, its series connection node is designated as b; Second switch Source electrode and the 4th switch
Figure 90216DEST_PATH_IMAGE020
Drain electrode links to each other, and its node is designated as d; Two series arm parallel connections, first switch Drain electrode and second switch
Figure 962543DEST_PATH_IMAGE016
Drain electrode link to each other the 3rd switch
Figure 699555DEST_PATH_IMAGE018
Source electrode and the 4th switch
Figure 160623DEST_PATH_IMAGE016
Source electrode link to each other, node is designated as respectively a, g; The grid of 4 MOSFET pipes connects signal successively
Figure 2012104714406100002DEST_PATH_IMAGE022
, ,
Figure 2012104714406100002DEST_PATH_IMAGE026
With
Figure 2012104714406100002DEST_PATH_IMAGE028
Diode bridge
Figure 715102DEST_PATH_IMAGE004
By 4 diodes ,
Figure 2012104714406100002DEST_PATH_IMAGE032
,
Figure 2012104714406100002DEST_PATH_IMAGE034
With
Figure 2012104714406100002DEST_PATH_IMAGE036
Form first diode
Figure 95460DEST_PATH_IMAGE030
With the 3rd diode Series arm and second diode With the 4th diode
Figure 473855DEST_PATH_IMAGE036
Series arm in parallel; First diode
Figure 140459DEST_PATH_IMAGE030
Negative electrode and the 3rd diode
Figure 219274DEST_PATH_IMAGE034
Anode link to each other, its series connection node is designated as c; Second diode
Figure 904202DEST_PATH_IMAGE032
Negative electrode and the 4th diode
Figure 675849DEST_PATH_IMAGE036
Anode link to each other, its series connection node is designated as e; First diode
Figure 564170DEST_PATH_IMAGE030
Anode and the 3rd diode
Figure 636556DEST_PATH_IMAGE034
The anode connected node be designated as f; The 3rd diode Negative electrode and the 4th diode
Figure 869271DEST_PATH_IMAGE036
Negative electrode link to each other and and switch bridge
Figure 307206DEST_PATH_IMAGE002
Share a node a; Node a and node f are exactly diode bridge Two sys nodes;
Two pumps are given birth to electric capacity
Figure 387343DEST_PATH_IMAGE006
,
Figure 438476DEST_PATH_IMAGE008
Respectively the switch bridge
Figure 363707DEST_PATH_IMAGE002
And diode bridge
Figure 774965DEST_PATH_IMAGE004
In separately brachium pontis couple together: first pump rises electric capacity
Figure 774145DEST_PATH_IMAGE006
Anode be connected in node b, negative terminal is connected in node c, second pump rises electric capacity Anode be connected in node d, negative terminal is connected in node e;
Filter inductance And filter capacitor Form a low pass filter, wherein, filter capacitor Two ends shunt load equivalent resistance
Figure 2012104714406100002DEST_PATH_IMAGE038
By ,
Figure 84614DEST_PATH_IMAGE010
,
Figure 588408DEST_PATH_IMAGE012
The two-port network that forms meets respectively node a and node f;
Node g connects input power
Figure 2012104714406100002DEST_PATH_IMAGE040
Anode, node f connects input power
Figure 77027DEST_PATH_IMAGE040
Negative terminal.
At first, converter in advance according to the input supply voltage fluctuation range ( ) and voltage switching point of ripple minimum principle calculating setting
Figure 2012104714406100002DEST_PATH_IMAGE044
, namely
Figure 2012104714406100002DEST_PATH_IMAGE046
When input voltage at switching point
Figure 562235DEST_PATH_IMAGE044
When changing up and down, the converter mode of operation that can automatically switch; Secondly, converter has two kinds of mode of operations, when
Figure 2012104714406100002DEST_PATH_IMAGE048
The time, namely be called the high input voltage situation, converter work this moment and pattern one, its voltage transmission ratio is D/ 2; When
Figure 2012104714406100002DEST_PATH_IMAGE050
The time, namely be called the low pressure input condition, converter work this moment and pattern two, its voltage transmission ratio is D DSpan be [0,1].
Compared to existing technology, the present invention has following beneficial effect:
The present invention has the autonomous function of switching of pattern.Converter in advance according to the input supply voltage fluctuation range (
Figure 73988DEST_PATH_IMAGE042
) and voltage switching point of ripple minimum principle calculating setting
Figure 381472DEST_PATH_IMAGE044
, when input voltage at switching point
Figure 272068DEST_PATH_IMAGE044
Near when fluctuation, converter can with For standard switching point automatic switchover mode of operation, make converter be operated in optimum state.
The present invention adopts distinctive dual-mode structure, can better adapt to the variation of input voltage.When input voltage large (
Figure 867839DEST_PATH_IMAGE048
) time, converter is operated in pattern one, and this moment, converter had large voltage transmission function, and the voltage transmission ratio is D/ 2, it is half of input voltage that pump rises capacitance voltage, has reduced half so the voltage stress of fly-wheel diode is compared with the BUCK converter in the situation; When input voltage less (
Figure 979014DEST_PATH_IMAGE050
) time, converter is operated in pattern two, and this moment, converter was the same with the BUCK converter, and the voltage transmission ratio is D, pump rises electric capacity and does not work, and it is half of input voltage that fly-wheel diode connects dividing potential drop and stress.
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Description of drawings
Fig. 1 is double-bridge structure circuit diagram of the present invention.
Fig. 2 has the double mode wide input decompression converter circuit schematic diagram of the double mode bridge-type of double-bridge structure.
Fig. 3 is that converter works in for the moment each switch mode equivalent schematic of pattern.
Fig. 4 is converter each switch mode equivalent schematic when working in pattern two.
Fig. 5 ~ 6th, main waveform schematic diagram under two kinds of mode of operations of converter.
Symbol and being denoted as among Fig. 1:
Figure 989696DEST_PATH_IMAGE014
~
Figure 144602DEST_PATH_IMAGE020
Represent four switch mosfet devices, they consist of the switch bridge
Figure 178418DEST_PATH_IMAGE002
Figure 890022DEST_PATH_IMAGE030
~
Figure 942160DEST_PATH_IMAGE036
Represent four diode components, they consist of diode bridge
Figure 81017DEST_PATH_IMAGE004
Figure 602129DEST_PATH_IMAGE006
,
Figure 851844DEST_PATH_IMAGE008
The expression pump rises electric capacity; A ~ g is connected node;
Consistent among Fig. 2 among the symbol of double-bridge structure and Fig. 1, the symbol of increase has:
Figure 24069DEST_PATH_IMAGE040
The expression input voltage;
Figure 271510DEST_PATH_IMAGE010
The expression filter inductance,
Figure 342234DEST_PATH_IMAGE012
The expression filter capacitor, they consist of low pass filter jointly;
Figure 573803DEST_PATH_IMAGE038
Expression load equivalent resistance.
Be consistent among same Fig. 1 of each symbol, 2 in the accompanying drawing 3 ~ 4.
Symbol and being denoted as in the accompanying drawing 5 ~ 6:
Figure 2012104714406100002DEST_PATH_IMAGE052
The expression switching tube
Figure 351266DEST_PATH_IMAGE014
,
Figure 18876DEST_PATH_IMAGE016
,
Figure 311318DEST_PATH_IMAGE018
,
Figure 106098DEST_PATH_IMAGE020
Working signal;
Figure 2012104714406100002DEST_PATH_IMAGE054
The expression inductance
Figure 987335DEST_PATH_IMAGE010
The electric current exemplary waveforms,
Figure 2012104714406100002DEST_PATH_IMAGE056
The mean value of expression inductance; The expression pump rises electric capacity
Figure 763530DEST_PATH_IMAGE006
,
Figure 808847DEST_PATH_IMAGE008
The voltage exemplary waveforms;
Figure 2012104714406100002DEST_PATH_IMAGE060
The expression switching tube
Figure 141739DEST_PATH_IMAGE014
, ,
Figure 968454DEST_PATH_IMAGE018
,
Figure 173171DEST_PATH_IMAGE020
The voltage stress exemplary waveforms;
Figure 2012104714406100002DEST_PATH_IMAGE062
The expression diode
Figure 559021DEST_PATH_IMAGE030
,
Figure 900004DEST_PATH_IMAGE032
,
Figure 158947DEST_PATH_IMAGE034
,
Figure 100227DEST_PATH_IMAGE036
The voltage stress exemplary waveforms.
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Embodiment
Below in conjunction with accompanying drawing embodiments of the present invention and operation principle are further described:
Referring to Fig. 1, be double-bridge structure circuit diagram of the present invention, Fig. 2 has the double mode wide input decompression converter circuit figure of the double mode bridge-type of double-bridge structure.Its circuit topology is characterized as: the switch bridge
Figure 837239DEST_PATH_IMAGE002
By N-channel MOS FET switch
Figure 298307DEST_PATH_IMAGE014
, Series arm and switch ,
Figure 369534DEST_PATH_IMAGE020
Series arm is in parallel to be consisted of, wherein switch
Figure 13005DEST_PATH_IMAGE014
, The series connection mid point is designated as b, switch
Figure 266974DEST_PATH_IMAGE016
,
Figure 283471DEST_PATH_IMAGE020
The series connection mid point is designated as d, and two branch circuit parallel connection nodes are designated as respectively a, g; Diode bridge
Figure 968399DEST_PATH_IMAGE004
By diode
Figure 474467DEST_PATH_IMAGE030
,
Figure 628368DEST_PATH_IMAGE034
Series arm and diode
Figure 510873DEST_PATH_IMAGE032
,
Figure 50308DEST_PATH_IMAGE036
Series arm is in parallel to be consisted of, wherein diode
Figure 930539DEST_PATH_IMAGE030
, The series connection mid point is designated as c, diode
Figure 976042DEST_PATH_IMAGE032
, The series connection mid point is designated as e, diode ,
Figure 159395DEST_PATH_IMAGE036
With the switch bridge
Figure 573584DEST_PATH_IMAGE002
Share a tie point, their negative terminals are connected in an a jointly, and diode
Figure 838343DEST_PATH_IMAGE030
,
Figure 122694DEST_PATH_IMAGE032
The common tie point of anode be designated as f.Tie point a and f are exactly diode bridge so
Figure 722171DEST_PATH_IMAGE004
Two be connected in parallel a little; Two pumps are given birth to electric capacity respectively the switch bridge
Figure 484591DEST_PATH_IMAGE002
And diode bridge
Figure 603857DEST_PATH_IMAGE004
In separately brachium pontis couple together, specifically connect as follows: pump rises electric capacity
Figure 59109DEST_PATH_IMAGE006
Anode be connected in a b, negative terminal is connected in a c, pump rises electric capacity
Figure 145882DEST_PATH_IMAGE008
Anode be connected in a d, negative terminal is connected in an e; Filter inductance
Figure 649676DEST_PATH_IMAGE010
And filter capacitor Form a low pass filter, wherein, electric capacity two ends shunt load equivalent resistance By ,
Figure 927893DEST_PATH_IMAGE010
,
Figure 285667DEST_PATH_IMAGE012
The two-port network that forms is tie point a and f respectively; Input power
Figure 82722DEST_PATH_IMAGE040
Anode is contact g in succession, and negative terminal is contact f in succession.The distinctive working in double modes character of the present invention has made its better compatibility and has reduced switching device (switching tube and diode) voltage stress and the advantage that increases the voltage transmission ratio, makes it better be applicable to the wider occasion of input voltage rate range.
Each switch mode equivalent schematic when Fig. 3, the 4th, converter work in two kinds of patterns, did following hypothesis before analyzing: 1. all switching tubes of converter, diode, energy-storage travelling wave tube are ideal element, and the capacitance voltage ripple is zero; 2. all inductance elements all are in continuous conduction mode in the converter.
The below is 3,4 narration specific works principle of the present invention and the courses of work with reference to the accompanying drawings:
For example: input direct voltage
Figure 2012104714406100002DEST_PATH_IMAGE064
,And output voltage requires to be stabilized in
Figure 2012104714406100002DEST_PATH_IMAGE066
The value of converter voltage transmission ratio under two kinds of different modes is with different, that is: so
Figure 2012104714406100002DEST_PATH_IMAGE068
,
Figure 2012104714406100002DEST_PATH_IMAGE070
And
Figure 2012104714406100002DEST_PATH_IMAGE072
,
Figure 940826DEST_PATH_IMAGE066
Condition under, in conjunction with ripple minimum principle (voltage transmission than more convergence and 0.5), obtain as calculated the voltage switching point
Figure 2012104714406100002DEST_PATH_IMAGE074
So in this example, when
Figure 2012104714406100002DEST_PATH_IMAGE076
The time, converter is operated in pattern for the moment better; When
Figure 2012104714406100002DEST_PATH_IMAGE078
The time, better when converter is operated in pattern two.
When be input as voltage higher ( ) time, the present invention works in pattern one, and it has four kinds of mode, below in conjunction with accompanying drawing 3, the work of each switch mode is analyzed.
Figure 2012104714406100002DEST_PATH_IMAGE080
Corresponding [0, the t of switch mode a( 1] constantly, its equivalent circuit accompanying drawing 3 mode (a))
At this moment, switching tube
Figure 187316DEST_PATH_IMAGE014
, Closure, , Disconnect diode
Figure 142710DEST_PATH_IMAGE032
,
Figure 281567DEST_PATH_IMAGE034
Work, ,
Figure 52394DEST_PATH_IMAGE036
Do not work.Input power
Figure 224619DEST_PATH_IMAGE040
Rise electric capacity by pump
Figure 472060DEST_PATH_IMAGE006
, diode Branch road powers to the load, and pump rises electric capacity
Figure 783142DEST_PATH_IMAGE006
Continue charging.Pump rises electric capacity
Figure 622922DEST_PATH_IMAGE008
Pass through diode
Figure 41265DEST_PATH_IMAGE032
To load continuous discharge, inductance
Figure 333706DEST_PATH_IMAGE010
Electric current is linear to be increased.
Figure 2012104714406100002DEST_PATH_IMAGE082
Corresponding [the t of switch mode b( 1, T S] constantly, its equivalent circuit accompanying drawing 3 mode (b), (d))
Switching tube
Figure 318367DEST_PATH_IMAGE014
,
Figure 12654DEST_PATH_IMAGE016
,
Figure 851165DEST_PATH_IMAGE018
,
Figure 896482DEST_PATH_IMAGE020
All closed, diode
Figure 229374DEST_PATH_IMAGE030
, ,
Figure 53160DEST_PATH_IMAGE034
, All work.Pump rises electric capacity
Figure 191197DEST_PATH_IMAGE006
,
Figure 47026DEST_PATH_IMAGE008
Keep voltage constant, inductance
Figure 243652DEST_PATH_IMAGE010
Pass through diode bridge
Figure 732403DEST_PATH_IMAGE004
To load discharge, its electric current linearity reduces.
Figure 2012104714406100002DEST_PATH_IMAGE084
Corresponding [the T of switch mode c( S, t 2] constantly, its equivalent circuit accompanying drawing 3 mode (c))
Switching tube
Figure 924874DEST_PATH_IMAGE016
,
Figure 385942DEST_PATH_IMAGE018
Closure, ,
Figure 978784DEST_PATH_IMAGE020
Disconnect diode
Figure 457170DEST_PATH_IMAGE030
,
Figure 835061DEST_PATH_IMAGE036
Work,
Figure 622758DEST_PATH_IMAGE032
, Do not work.Input power
Figure 368177DEST_PATH_IMAGE040
Rise electric capacity by pump , diode
Figure 559173DEST_PATH_IMAGE036
Branch road powers to the load, and pump rises electric capacity
Figure 713073DEST_PATH_IMAGE006
Continue charging.Pump rises electric capacity
Figure 595579DEST_PATH_IMAGE006
Pass through diode
Figure 126224DEST_PATH_IMAGE030
To load continuous discharge, inductance
Figure 803193DEST_PATH_IMAGE010
Electric current is linear to be increased.
Figure 2012104714406100002DEST_PATH_IMAGE086
Corresponding [the t of switch mode d( 2, 2T S] constantly, its equivalent circuit accompanying drawing 3 mode (b), (d))
Its operation mode and
Figure 365762DEST_PATH_IMAGE082
Unanimously.
To sum up, with inductance
Figure 51958DEST_PATH_IMAGE010
Discharge and recharge once as one-period T S, mode a(or mode c) work time and cycle T SRatio then be duty ratio DSo in one-period, by inductance weber balance can obtain converter voltage transmission relation formula: , can be calculated pump and rise electric capacity
Figure 196631DEST_PATH_IMAGE006
,
Figure 497032DEST_PATH_IMAGE008
The duty ratio of the voltage at two ends and converter work DHave no relations, it is on average to being
Figure 2012104714406100002DEST_PATH_IMAGE090
, because pump rises electric capacity, the voltage stress of switching tube and diode is clamped at too Can find out that converter has higher voltage transmission ratio for the moment in pattern, and the voltage stress of switching tube and diode is less.
When be input as voltage lower (
Figure 771204DEST_PATH_IMAGE050
) time, the present invention works in pattern two, and it also has four kinds of mode, below in conjunction with accompanying drawing 4, the work of each switch mode is analyzed.
Figure 98280DEST_PATH_IMAGE080
Corresponding [0, the t of switch mode a( 1] constantly, its equivalent circuit accompanying drawing 4 mode (a))
At this moment, switching tube
Figure 320314DEST_PATH_IMAGE014
,
Figure 467262DEST_PATH_IMAGE018
Closure,
Figure 685141DEST_PATH_IMAGE016
, Disconnect diode
Figure 259659DEST_PATH_IMAGE030
,
Figure 346432DEST_PATH_IMAGE032
,
Figure 912543DEST_PATH_IMAGE034
,
Figure 886315DEST_PATH_IMAGE036
Do not work.Input power
Figure 512468DEST_PATH_IMAGE040
Directly power to the load, pump rises electric capacity
Figure 820959DEST_PATH_IMAGE006
,
Figure 128443DEST_PATH_IMAGE008
Do not work inductance
Figure 284618DEST_PATH_IMAGE010
Electric current is linear to be increased.
Figure 268624DEST_PATH_IMAGE082
Corresponding [the t of switch mode b( 1, T S] constantly, its equivalent circuit accompanying drawing 4 mode (b), (d))
Switching tube
Figure 877460DEST_PATH_IMAGE014
, ,
Figure 923618DEST_PATH_IMAGE018
,
Figure 891574DEST_PATH_IMAGE020
All closed, diode
Figure 925389DEST_PATH_IMAGE030
,
Figure 636993DEST_PATH_IMAGE032
,
Figure 954710DEST_PATH_IMAGE034
,
Figure 93568DEST_PATH_IMAGE036
All work.Pump rises electric capacity
Figure 349100DEST_PATH_IMAGE006
,
Figure 51345DEST_PATH_IMAGE008
Do not work inductance
Figure 36619DEST_PATH_IMAGE010
Pass through diode bridge
Figure 284061DEST_PATH_IMAGE004
To load discharge, its electric current linearity reduces.
Figure 89206DEST_PATH_IMAGE084
Corresponding [the T of switch mode c( S, t 2] constantly, its equivalent circuit accompanying drawing 4 mode (c))
Switching tube
Figure 329563DEST_PATH_IMAGE016
,
Figure 107026DEST_PATH_IMAGE020
Closure,
Figure 587686DEST_PATH_IMAGE014
,
Figure 335587DEST_PATH_IMAGE018
Disconnect diode
Figure 927105DEST_PATH_IMAGE030
,
Figure 824654DEST_PATH_IMAGE032
,
Figure 476215DEST_PATH_IMAGE034
, Do not work.Input power
Figure 775795DEST_PATH_IMAGE040
Directly power to the load, pump rises electric capacity
Figure 590167DEST_PATH_IMAGE006
, Do not work inductance
Figure 866614DEST_PATH_IMAGE010
Electric current is linear to be increased.
Figure 3197DEST_PATH_IMAGE086
Corresponding [the t of switch mode d( 2, 2T S] constantly, its equivalent circuit accompanying drawing 4 mode (b), (d))
Its operation mode and
Figure 859027DEST_PATH_IMAGE082
Unanimously.
To sum up, and 1 is similar, with inductance
Figure 852390DEST_PATH_IMAGE010
Discharge and recharge once as one-period T S, mode a(or mode c) work time and cycle T SRatio then be duty ratio DSo in one-period, by inductance weber balance can obtain converter voltage transmission relation formula:
Figure DEST_PATH_IMAGE092
, but because under this pattern, switching tube and diode all are two tandem workings, its voltage stress is structure and reduce half thus also.Can find out that converter is identical with common BUCK variator when pattern two, but the voltage stress of switching tube and diode is less.
Fig. 5,6 is respectively the main waveform schematic diagram under converter work and the two kinds of patterns.
Find out that by Fig. 5 pump rises electric capacity
Figure 544403DEST_PATH_IMAGE006
,
Figure 748593DEST_PATH_IMAGE008
The voltage at two ends intermeshes, and works as switching tube
Figure 271978DEST_PATH_IMAGE014
, ,
Figure 802503DEST_PATH_IMAGE018
,
Figure 343205DEST_PATH_IMAGE020
During equal closure, it all remains unchanged.Fig. 6 finds out that pump rises electric capacity
Figure 658780DEST_PATH_IMAGE006
,
Figure 446477DEST_PATH_IMAGE008
Do not work, its value is zero.
The present invention utilizes the switch bridge
Figure 909819DEST_PATH_IMAGE002
And diode bridge
Figure 191896DEST_PATH_IMAGE004
Double-bridge structure, adopt double working modes compatible better reduce switching device (switching tube and diode) voltage stress and increase the advantage of voltage transmission ratio; And under two kinds of mode of operations, the voltage stress of switching tube and diode is all less; Set switching value according to the ripple minimum principle simultaneously, make the present invention also have the autonomous function of switching of pattern.To sum up, the present invention can be applicable to the wider occasion of input voltage rate range better.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For those skilled in the art in the invention, can also make again suitable deduction, equivalents, improvement etc., but construct under the prerequisite of thinking not breaking away from the present invention, all should be included in protection scope of the present invention.

Claims (2)

1. the double mode wide input buck converter of bridge-type is characterized in that, comprises: the switch bridge
Figure 2012104714406100001DEST_PATH_IMAGE001
, diode bridge
Figure 546185DEST_PATH_IMAGE002
, two pumps rise electric capacity
Figure 2012104714406100001DEST_PATH_IMAGE003
,
Figure 401008DEST_PATH_IMAGE004
, filter inductance
Figure 2012104714406100001DEST_PATH_IMAGE005
And filter capacitor
Figure 367696DEST_PATH_IMAGE006
Wherein, described switch bridge By 4 N channel enhancement switch mosfets
Figure 2012104714406100001DEST_PATH_IMAGE007
,
Figure 701911DEST_PATH_IMAGE008
,
Figure 2012104714406100001DEST_PATH_IMAGE009
With
Figure 462057DEST_PATH_IMAGE010
Form first switch
Figure 729090DEST_PATH_IMAGE007
With the 3rd switch
Figure 114941DEST_PATH_IMAGE009
Series arm and second switch
Figure 721503DEST_PATH_IMAGE008
, the 4th switch
Figure 714867DEST_PATH_IMAGE010
Series arm in parallel; First switch
Figure 659077DEST_PATH_IMAGE007
Source electrode and the 3rd switch
Figure 333771DEST_PATH_IMAGE009
Drain electrode link to each other, its series connection node is designated as b; Second switch
Figure 857157DEST_PATH_IMAGE008
Source electrode and the 4th switch
Figure 473952DEST_PATH_IMAGE010
Drain electrode links to each other, and its node is designated as d; Two series arm parallel connections, first switch
Figure 715577DEST_PATH_IMAGE007
Drain electrode and second switch
Figure 928384DEST_PATH_IMAGE008
Drain electrode link to each other the 3rd switch
Figure 758805DEST_PATH_IMAGE009
Source electrode and the 4th switch
Figure 93972DEST_PATH_IMAGE008
Source electrode link to each other, node is designated as respectively a, g; The grid of 4 MOSFET pipes connects signal successively
Figure 2012104714406100001DEST_PATH_IMAGE011
,
Figure 760577DEST_PATH_IMAGE012
,
Figure 2012104714406100001DEST_PATH_IMAGE013
With
Figure 26342DEST_PATH_IMAGE014
Diode bridge
Figure 462002DEST_PATH_IMAGE002
By 4 diodes
Figure 2012104714406100001DEST_PATH_IMAGE015
,
Figure 423530DEST_PATH_IMAGE016
, With
Figure 311851DEST_PATH_IMAGE018
Form first diode With the 3rd diode
Figure 733791DEST_PATH_IMAGE017
Series arm and second diode
Figure 614022DEST_PATH_IMAGE016
With the 4th diode
Figure 238908DEST_PATH_IMAGE018
Series arm in parallel; First diode
Figure 659525DEST_PATH_IMAGE015
Negative electrode and the 3rd diode Anode link to each other, its series connection node is designated as c; Second diode
Figure 183227DEST_PATH_IMAGE016
Negative electrode and the 4th diode
Figure 295408DEST_PATH_IMAGE018
Anode link to each other, its series connection node is designated as e; First diode
Figure 457399DEST_PATH_IMAGE015
Anode and the 3rd diode
Figure 518896DEST_PATH_IMAGE017
The anode connected node be designated as f; The 3rd diode Negative electrode and the 4th diode Negative electrode link to each other and and switch bridge Share a node a; Node a and node f are exactly diode bridge
Figure 541200DEST_PATH_IMAGE002
Two sys nodes;
Two pumps are given birth to electric capacity
Figure 917824DEST_PATH_IMAGE003
,
Figure 755330DEST_PATH_IMAGE004
Respectively the switch bridge
Figure 321440DEST_PATH_IMAGE001
And diode bridge
Figure 810059DEST_PATH_IMAGE002
In separately brachium pontis couple together: first pump rises electric capacity
Figure 170633DEST_PATH_IMAGE003
Anode be connected in node b, negative terminal is connected in node c, second pump rises electric capacity
Figure 495436DEST_PATH_IMAGE004
Anode be connected in node d, negative terminal is connected in node e;
Filter inductance
Figure 52188DEST_PATH_IMAGE005
And filter capacitor
Figure 942783DEST_PATH_IMAGE006
Form a low pass filter, wherein, filter capacitor Two ends shunt load equivalent resistance By
Figure 476237DEST_PATH_IMAGE019
,
Figure 649730DEST_PATH_IMAGE005
,
Figure 598094DEST_PATH_IMAGE006
The two-port network that forms meets respectively node a and node f;
Node g connects input power
Figure 753001DEST_PATH_IMAGE020
Anode, node f connects input power
Figure 849133DEST_PATH_IMAGE020
Negative terminal.
2. the double mode wide input buck converter of described bridge-type according to claim 1 is characterized in that, at first, converter should be in advance according to the input supply voltage fluctuation range (
Figure 2012104714406100001DEST_PATH_IMAGE021
) and voltage switching point of ripple minimum principle calculating setting , namely
Figure 2012104714406100001DEST_PATH_IMAGE023
When input voltage at switching point
Figure 488242DEST_PATH_IMAGE022
When changing up and down, the converter mode of operation that can automatically switch; Secondly, converter has two kinds of mode of operations, when The time, namely be called the high input voltage situation, converter work this moment and pattern one, its voltage transmission ratio is D/ 2; When
Figure 2012104714406100001DEST_PATH_IMAGE025
The time, namely be called the low pressure input condition, converter work this moment and pattern two, its voltage transmission ratio is D DSpan be [0,1].
CN201210471440.6A 2012-11-20 2012-11-20 Bridge-type dual-mode wide-input buck converter Expired - Fee Related CN102916582B (en)

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